Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Gematrik
Gematrik is an easy to use app that lets you quickly calculate the gematria values for words and see them all in one place
$1.79 · In-app purchases
PRICE
$1.79
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Gematrik: map the core Entertainment workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Expand database with user submissions and API integration.
Assumption to check: Limited word database for gematria calculations
Validate with people who use this workflow before building.
Hypothesis 2
Add sharing options for calculated results.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement themes and font size adjustments.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline access for previously searched words.
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Gematrik is an easy to use app that lets you quickly calculate the gematria values for words and see them all in one place. If you calculate gematria values often, you will appreciate the speed and convenience this app offers over having to calculate yourself or searching in a browser while being online. In addition, it lets you compare offline the value of a word vs. 10,000 of the most commonly used words in the English language to see which other words share the same value. Features: -Works with a single word, a sentence, or even a pasted in paragraph. -Comparison of an inputted word vs. 10,000 of the most common English words in order of frequency, as determined by n-gram frequency analysis of the Google's Trillion Word Corpus. -7 different ciphers automatically calculated to see quickly at-a-glance. -Breakdown images of how word values are calculated depending on cipher. -Works offline, no internet required. Following ciphers are calculated: -English Ordinal (Simple) -Full Reduction (Pythagorean) -Reverse Ordinal -Reverse Full Reduction -Hebrew -English Gematria -Chaldean
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
Axios
React Navigation
Node.js
BUILD KIT DIFFICULTY
Starter
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
